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Message-ID: <20131004184629.GA17550@redhat.com>
Date: Fri, 4 Oct 2013 20:46:29 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Paul McKenney <paulmck@...ux.vnet.ibm.com>,
Peter Zijlstra <peterz@...radead.org>
Cc: Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
Ingo Molnar <mingo@...nel.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Johannes Weiner <hannes@...xchg.org>,
Thomas Gleixner <tglx@...utronix.de>,
Steven Rostedt <rostedt@...dmis.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] rcusync: introduce struct rcu_sync_ops
Add the new struct rcu_sync_ops which holds sync/call methods, and
turn the function pointers in rcu_sync_struct into the single pointer
to struct rcu_sync_ops.
This simplifies the "init" helpers, and this way it is simpler to add
the new methods we need, especially ifdef'ed.
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
include/linux/rcusync.h | 63 +++++++++++++++++++++--------------------------
kernel/rcusync.c | 40 ++++++++++++++---------------
2 files changed, 47 insertions(+), 56 deletions(-)
diff --git a/include/linux/rcusync.h b/include/linux/rcusync.h
index 7858491..30c6037 100644
--- a/include/linux/rcusync.h
+++ b/include/linux/rcusync.h
@@ -4,6 +4,11 @@
#include <linux/wait.h>
#include <linux/rcupdate.h>
+struct rcu_sync_ops {
+ void (*sync)(void);
+ void (*call)(struct rcu_head *, void (*)(struct rcu_head *));
+};
+
struct rcu_sync_struct {
int gp_state;
int gp_count;
@@ -12,43 +17,9 @@ struct rcu_sync_struct {
int cb_state;
struct rcu_head cb_head;
- void (*sync)(void);
- void (*call)(struct rcu_head *, void (*)(struct rcu_head *));
+ struct rcu_sync_ops *ops;
};
-#define ___RCU_SYNC_INIT(name) \
- .gp_state = 0, \
- .gp_count = 0, \
- .gp_wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.gp_wait), \
- .cb_state = 0
-
-#define __RCU_SCHED_SYNC_INIT(name) { \
- ___RCU_SYNC_INIT(name), \
- .sync = synchronize_sched, \
- .call = call_rcu_sched, \
-}
-
-#define __RCU_BH_SYNC_INIT(name) { \
- ___RCU_SYNC_INIT(name), \
- .sync = synchronize_rcu_bh, \
- .call = call_rcu_bh, \
-}
-
-#define __RCU_SYNC_INIT(name) { \
- ___RCU_SYNC_INIT(name), \
- .sync = synchronize_rcu, \
- .call = call_rcu, \
-}
-
-#define DEFINE_RCU_SCHED_SYNC(name) \
- struct rcu_sync_struct name = __RCU_SCHED_SYNC_INIT(name)
-
-#define DEFINE_RCU_BH_SYNC(name) \
- struct rcu_sync_struct name = __RCU_BH_SYNC_INIT(name)
-
-#define DEFINE_RCU_SYNC(name) \
- struct rcu_sync_struct name = __RCU_SYNC_INIT(name)
-
static inline bool rcu_sync_is_idle(struct rcu_sync_struct *rss)
{
return !rss->gp_state; /* GP_IDLE */
@@ -60,5 +31,27 @@ extern void rcu_sync_init(struct rcu_sync_struct *, enum rcu_sync_type);
extern void rcu_sync_enter(struct rcu_sync_struct *);
extern void rcu_sync_exit(struct rcu_sync_struct *);
+extern struct rcu_sync_ops rcu_sync_ops_array[];
+
+#define __RCU_SYNC_INITIALIZER(name, type) { \
+ .gp_state = 0, \
+ .gp_count = 0, \
+ .gp_wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.gp_wait), \
+ .cb_state = 0, \
+ .ops = rcu_sync_ops_array + (type), \
+ }
+
+#define __DEFINE_RCU_SYNC(name, type) \
+ struct rcu_sync_struct name = __RCU_SYNC_INITIALIZER(name, type)
+
+#define DEFINE_RCU_SYNC(name) \
+ __DEFINE_RCU_SYNC(name, RCU_SYNC)
+
+#define DEFINE_RCU_SCHED_SYNC(name) \
+ __DEFINE_RCU_SYNC(name, RCU_SCHED_SYNC)
+
+#define DEFINE_RCU_BH_SYNC(name) \
+ __DEFINE_RCU_SYNC(name, RCU_BH_SYNC)
+
#endif /* _LINUX_RCUSYNC_H_ */
diff --git a/kernel/rcusync.c b/kernel/rcusync.c
index f84176a..1cefb83 100644
--- a/kernel/rcusync.c
+++ b/kernel/rcusync.c
@@ -1,4 +1,3 @@
-
#include <linux/rcusync.h>
#include <linux/sched.h>
@@ -7,27 +6,26 @@ enum { CB_IDLE = 0, CB_PENDING, CB_REPLAY };
#define rss_lock gp_wait.lock
+struct rcu_sync_ops rcu_sync_ops_array[] = {
+ [RCU_SYNC] = {
+ .sync = synchronize_rcu,
+ .call = call_rcu,
+ },
+ [RCU_SCHED_SYNC] = {
+ .sync = synchronize_sched,
+ .call = call_rcu_sched,
+ },
+ [RCU_BH_SYNC] = {
+ .sync = synchronize_rcu_bh,
+ .call = call_rcu_bh,
+ },
+};
+
void rcu_sync_init(struct rcu_sync_struct *rss, enum rcu_sync_type type)
{
memset(rss, 0, sizeof(*rss));
init_waitqueue_head(&rss->gp_wait);
-
- switch (type) {
- case RCU_SYNC:
- rss->sync = synchronize_rcu;
- rss->call = call_rcu;
- break;
-
- case RCU_SCHED_SYNC:
- rss->sync = synchronize_sched;
- rss->call = call_rcu_sched;
- break;
-
- case RCU_BH_SYNC:
- rss->sync = synchronize_rcu_bh;
- rss->call = call_rcu_bh;
- break;
- }
+ rss->ops = rcu_sync_ops_array + type;
}
void rcu_sync_enter(struct rcu_sync_struct *rss)
@@ -44,7 +42,7 @@ void rcu_sync_enter(struct rcu_sync_struct *rss)
BUG_ON(need_wait && need_sync);
if (need_sync) {
- rss->sync();
+ rss->ops->sync();
rss->gp_state = GP_PASSED;
wake_up_all(&rss->gp_wait);
} else if (need_wait) {
@@ -81,7 +79,7 @@ static void rcu_sync_func(struct rcu_head *rcu)
* to catch a later GP.
*/
rss->cb_state = CB_PENDING;
- rss->call(&rss->cb_head, rcu_sync_func);
+ rss->ops->call(&rss->cb_head, rcu_sync_func);
} else {
/*
* We're at least a GP after rcu_sync_exit(); eveybody will now
@@ -99,7 +97,7 @@ void rcu_sync_exit(struct rcu_sync_struct *rss)
if (!--rss->gp_count) {
if (rss->cb_state == CB_IDLE) {
rss->cb_state = CB_PENDING;
- rss->call(&rss->cb_head, rcu_sync_func);
+ rss->ops->call(&rss->cb_head, rcu_sync_func);
} else if (rss->cb_state == CB_PENDING) {
rss->cb_state = CB_REPLAY;
}
--
1.5.5.1
--
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